SPN 412
CAUTION
EGR temperature
The truck's control module (ECU) reports a fault on: EGR temperature.
SPN 412 means a truck control module (ECU) flagged a fault on EGR temperature, part of the EGR system on heavy-duty diesel trucks. DERATE rates it CAUTION: you can keep driving carefully, but get it checked soon. Part usually replaced: EGR temperature sensor, $60–$220 (aftermarket to dealer) plus 0.5–1 h labor.
EGR
Can I keep driving?
Yes, carefully. It does not usually cut power, but get it checked soon.
Part usually replaced
EGR temperature sensor
$60–$220 (aftermarket to dealer)
Labor: 0.5–1 h
USD, part only. Labor is billed at the shop's hourly rate.
Data: DERATE verified base, updated October 2026
Related codes
Read it off your own dash
Take one photo and DERATE tells you whether you can keep driving.
Ask DERATE
DERATE assists. It does not replace inspection by a qualified technician.